By Scott Owens (auth.), Sophia Drossopoulou (eds.)

This ebook constitutes the refereed court cases of the seventeenth eu Symposium on Programming, ESOP 2008, held in Budapest, Hungary, in March/April 2008, as a part of ETAPS 2008, the ecu Joint meetings on thought and perform of software program.

The 25 revised complete papers awarded including the summary of 1 invited speak and device displays have been conscientiously reviewed and chosen from 104 submissions and handle primary matters within the specification, research, and implementation of programming languages and sytems. The papers are prepared in topical sections on static research, safeguard, concurrency and software verification.

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Additional info for Programming Languages and Systems: 17th European Symposium on Programming, ESOP 2008, Held as Part of the Joint European Conferences on Theory and Practice of Software, ETAPS 2008, Budapest, Hungary, March 29-April 6, 2008. Proceedings

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E1 = e2 : τ if for all k ≥ 0, σ e1 ≤k Parametric Polymorphism through Run-Time Sealing Corollary 1. For any seal-free term e such that we have that eτ = eτ : τ . 1 Dynamic Sealing Replaces Boundaries The contract system of the previous section is a multi-language system, but just barely, since the only part of ML we make any use of is its boundary form to get back into Scheme. In this section we restrict our attention to Scheme plus boundaries used only for the purpose of implementing contracts, and we show an alternate implementation of contracts that uses dynamic sealing.

Y¯ : c[]? , to conclude, for example, that Γ, y¯:c[]? y¯ : c[]? |d[]∗ . This is valid since c[]? <: c[]? |d[]∗ . Suppose, instead, that we actually wanted to show that the above expression has type (b[d[]∗ ]|c[]? )∗ , also a supertype of the derived type. There are again several ways of doing this. Besides using subsumption at the end of the derivation, we could use it on Γ x ¯/child : b[]∗ , c[]? to obtain Γ x ¯/child : (b[d[]∗ ]|c[]? )∗ . To complete the derivation, we would then need to replace derivation D with D : 38 J.

It follows that leaves(¯ z ) : leaf [string]∗ , so the for-loop has type (leaf [string]∗ )∗ . Again using subsumption, we can conclude that x/leaf , leaves(x/node/tree) : leaf [string], (leaf [string]∗ )∗ <: leaf [string]∗ . Notice that although we could have used subsumption in several more places, we really needed it in only two places: when typechecking a function call, and when checking the result of a function against its declared type. g. Pierce [16, Ch. 16]) to deciding declarative typechecking is to define algorithmic judgments that are syntax-directed and decidable, and then show that the algorithmic system is complete relative to the declarative system.

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